396 lines
13 KiB
C
396 lines
13 KiB
C
/*
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v4l2 common internal API header
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This header contains internal shared ioctl definitions for use by the
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internal low-level v4l2 drivers.
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Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal
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define,
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Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef V4L2_COMMON_H_
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#define V4L2_COMMON_H_
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#include <media/v4l2-dev.h>
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/* Common printk constructs for v4l-i2c drivers. These macros create a unique
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prefix consisting of the driver name, the adapter number and the i2c
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address. */
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#define v4l_printk(level, name, adapter, addr, fmt, arg...) \
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printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)
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#define v4l_client_printk(level, client, fmt, arg...) \
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v4l_printk(level, (client)->dev.driver->name, (client)->adapter, \
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(client)->addr, fmt , ## arg)
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#define v4l_err(client, fmt, arg...) \
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v4l_client_printk(KERN_ERR, client, fmt , ## arg)
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#define v4l_warn(client, fmt, arg...) \
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v4l_client_printk(KERN_WARNING, client, fmt , ## arg)
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#define v4l_info(client, fmt, arg...) \
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v4l_client_printk(KERN_INFO, client, fmt , ## arg)
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/* These three macros assume that the debug level is set with a module
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parameter called 'debug'. */
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#define v4l_dbg(level, debug, client, fmt, arg...) \
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do { \
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if (debug >= (level)) \
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v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
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} while (0)
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/* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */
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#define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...) \
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do { \
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if (__debug >= (__level)) \
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dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg); \
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} while (0)
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/* ------------------------------------------------------------------------- */
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/* These printk constructs can be used with v4l2_device and v4l2_subdev */
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#define v4l2_printk(level, dev, fmt, arg...) \
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printk(level "%s: " fmt, (dev)->name , ## arg)
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#define v4l2_err(dev, fmt, arg...) \
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v4l2_printk(KERN_ERR, dev, fmt , ## arg)
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#define v4l2_warn(dev, fmt, arg...) \
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v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
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#define v4l2_info(dev, fmt, arg...) \
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v4l2_printk(KERN_INFO, dev, fmt , ## arg)
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/* These three macros assume that the debug level is set with a module
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parameter called 'debug'. */
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#define v4l2_dbg(level, debug, dev, fmt, arg...) \
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do { \
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if (debug >= (level)) \
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v4l2_printk(KERN_DEBUG, dev, fmt , ## arg); \
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} while (0)
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/**
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* v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl
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*
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* @qctrl: pointer to the &struct v4l2_queryctrl to be filled
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* @min: minimum value for the control
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* @max: maximum value for the control
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* @step: control step
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* @def: default value for the control
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*
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* Fills the &struct v4l2_queryctrl fields for the query control.
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*
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* .. note::
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*
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* This function assumes that the @qctrl->id field is filled.
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*
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* Returns -EINVAL if the control is not known by the V4L2 core, 0 on success.
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*/
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int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl,
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s32 min, s32 max, s32 step, s32 def);
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/* ------------------------------------------------------------------------- */
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/* I2C Helper functions */
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struct i2c_driver;
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struct i2c_adapter;
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struct i2c_client;
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struct i2c_device_id;
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struct v4l2_device;
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struct v4l2_subdev;
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struct v4l2_subdev_ops;
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/**
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* v4l2_i2c_new_subdev - Load an i2c module and return an initialized
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* &struct v4l2_subdev.
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*
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* @v4l2_dev: pointer to &struct v4l2_device
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* @adapter: pointer to struct i2c_adapter
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* @client_type: name of the chip that's on the adapter.
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* @addr: I2C address. If zero, it will use @probe_addrs
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* @probe_addrs: array with a list of address. The last entry at such
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* array should be %I2C_CLIENT_END.
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*
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* returns a &struct v4l2_subdev pointer.
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*/
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struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
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struct i2c_adapter *adapter, const char *client_type,
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u8 addr, const unsigned short *probe_addrs);
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struct i2c_board_info;
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/**
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* v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized
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* &struct v4l2_subdev.
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*
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* @v4l2_dev: pointer to &struct v4l2_device
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* @adapter: pointer to struct i2c_adapter
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* @info: pointer to struct i2c_board_info used to replace the irq,
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* platform_data and addr arguments.
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* @probe_addrs: array with a list of address. The last entry at such
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* array should be %I2C_CLIENT_END.
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*
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* returns a &struct v4l2_subdev pointer.
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*/
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struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
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struct i2c_adapter *adapter, struct i2c_board_info *info,
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const unsigned short *probe_addrs);
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/**
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* v4l2_i2c_subdev_set_name - Set name for an I²C sub-device
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*
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* @sd: pointer to &struct v4l2_subdev
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* @client: pointer to struct i2c_client
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* @devname: the name of the device; if NULL, the I²C device's name will be used
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* @postfix: sub-device specific string to put right after the I²C device name;
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* may be NULL
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*/
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void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client,
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const char *devname, const char *postfix);
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/**
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* v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from
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* an i2c_client struct.
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*
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* @sd: pointer to &struct v4l2_subdev
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* @client: pointer to struct i2c_client
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* @ops: pointer to &struct v4l2_subdev_ops
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*/
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void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
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const struct v4l2_subdev_ops *ops);
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/**
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* v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev.
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*
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* @sd: pointer to &struct v4l2_subdev
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*
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* Returns the address of an I2C sub-device
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*/
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unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
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/**
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* enum v4l2_i2c_tuner_type - specifies the range of tuner address that
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* should be used when seeking for I2C devices.
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*
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* @ADDRS_RADIO: Radio tuner addresses.
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* Represent the following I2C addresses:
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* 0x10 (if compiled with tea5761 support)
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* and 0x60.
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* @ADDRS_DEMOD: Demod tuner addresses.
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* Represent the following I2C addresses:
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* 0x42, 0x43, 0x4a and 0x4b.
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* @ADDRS_TV: TV tuner addresses.
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* Represent the following I2C addresses:
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* 0x42, 0x43, 0x4a, 0x4b, 0x60, 0x61, 0x62,
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* 0x63 and 0x64.
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* @ADDRS_TV_WITH_DEMOD: TV tuner addresses if demod is present, this
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* excludes addresses used by the demodulator
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* from the list of candidates.
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* Represent the following I2C addresses:
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* 0x60, 0x61, 0x62, 0x63 and 0x64.
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*
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* NOTE: All I2C addresses above use the 7-bit notation.
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*/
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enum v4l2_i2c_tuner_type {
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ADDRS_RADIO,
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ADDRS_DEMOD,
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ADDRS_TV,
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ADDRS_TV_WITH_DEMOD,
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};
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/**
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* v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe.
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*
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* @type: type of the tuner to seek, as defined by
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* &enum v4l2_i2c_tuner_type.
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*
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* NOTE: Use only if the tuner addresses are unknown.
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*/
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const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);
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/* ------------------------------------------------------------------------- */
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/* SPI Helper functions */
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#if defined(CONFIG_SPI)
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#include <linux/spi/spi.h>
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struct spi_device;
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/**
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* v4l2_spi_new_subdev - Load an spi module and return an initialized
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* &struct v4l2_subdev.
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*
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*
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* @v4l2_dev: pointer to &struct v4l2_device.
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* @master: pointer to struct spi_master.
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* @info: pointer to struct spi_board_info.
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*
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* returns a &struct v4l2_subdev pointer.
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*/
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struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
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struct spi_master *master, struct spi_board_info *info);
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/**
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* v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an
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* spi_device struct.
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*
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* @sd: pointer to &struct v4l2_subdev
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* @spi: pointer to struct spi_device.
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* @ops: pointer to &struct v4l2_subdev_ops
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*/
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void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
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const struct v4l2_subdev_ops *ops);
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#endif
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/* ------------------------------------------------------------------------- */
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/*
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* FIXME: these remaining ioctls/structs should be removed as well, but they
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* are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET).
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* To remove these ioctls some more cleanup is needed in those modules.
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*
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* It doesn't make much sense on documenting them, as what we really want is
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* to get rid of them.
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*/
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/* s_config */
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struct v4l2_priv_tun_config {
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int tuner;
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void *priv;
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};
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#define TUNER_SET_CONFIG _IOW('d', 92, struct v4l2_priv_tun_config)
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#define VIDIOC_INT_RESET _IOW ('d', 102, u32)
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/* ------------------------------------------------------------------------- */
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/* Miscellaneous helper functions */
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/**
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* v4l_bound_align_image - adjust video dimensions according to
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* a given constraints.
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*
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* @width: pointer to width that will be adjusted if needed.
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* @wmin: minimum width.
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* @wmax: maximum width.
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* @walign: least significant bit on width.
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* @height: pointer to height that will be adjusted if needed.
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* @hmin: minimum height.
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* @hmax: maximum height.
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* @halign: least significant bit on height.
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* @salign: least significant bit for the image size (e. g.
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* :math:`width * height`).
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*
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* Clip an image to have @width between @wmin and @wmax, and @height between
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* @hmin and @hmax, inclusive.
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*
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* Additionally, the @width will be a multiple of :math:`2^{walign}`,
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* the @height will be a multiple of :math:`2^{halign}`, and the overall
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* size :math:`width * height` will be a multiple of :math:`2^{salign}`.
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*
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* .. note::
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*
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* #. The clipping rectangle may be shrunk or enlarged to fit the alignment
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* constraints.
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* #. @wmax must not be smaller than @wmin.
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* #. @hmax must not be smaller than @hmin.
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* #. The alignments must not be so high there are no possible image
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* sizes within the allowed bounds.
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* #. @wmin and @hmin must be at least 1 (don't use 0).
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* #. For @walign, @halign and @salign, if you don't care about a certain
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* alignment, specify ``0``, as :math:`2^0 = 1` and one byte alignment
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* is equivalent to no alignment.
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* #. If you only want to adjust downward, specify a maximum that's the
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* same as the initial value.
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*/
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void v4l_bound_align_image(unsigned int *width, unsigned int wmin,
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unsigned int wmax, unsigned int walign,
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unsigned int *height, unsigned int hmin,
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unsigned int hmax, unsigned int halign,
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unsigned int salign);
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/**
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* v4l2_find_nearest_size - Find the nearest size among a discrete
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* set of resolutions contained in an array of a driver specific struct.
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*
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* @array: a driver specific array of image sizes
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* @array_size: the length of the driver specific array of image sizes
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* @width_field: the name of the width field in the driver specific struct
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* @height_field: the name of the height field in the driver specific struct
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* @width: desired width.
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* @height: desired height.
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*
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* Finds the closest resolution to minimize the width and height differences
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* between what requested and the supported resolutions. The size of the width
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* and height fields in the driver specific must equal to that of u32, i.e. four
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* bytes.
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*
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* Returns the best match or NULL if the length of the array is zero.
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*/
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#define v4l2_find_nearest_size(array, array_size, width_field, height_field, \
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width, height) \
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({ \
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BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \
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sizeof((array)->height_field) != sizeof(u32)); \
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(typeof(&(array)[0]))__v4l2_find_nearest_size( \
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(array), array_size, sizeof(*(array)), \
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offsetof(typeof(*(array)), width_field), \
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offsetof(typeof(*(array)), height_field), \
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width, height); \
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})
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const void *
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__v4l2_find_nearest_size(const void *array, size_t array_size,
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size_t entry_size, size_t width_offset,
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size_t height_offset, s32 width, s32 height);
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/**
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* v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by
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* calling the g_frame_interval op of the given subdev. It only works
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* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
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* function name.
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*
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* @vdev: the struct video_device pointer. Used to determine the device caps.
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* @sd: the sub-device pointer.
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* @a: the VIDIOC_G_PARM argument.
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*/
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int v4l2_g_parm_cap(struct video_device *vdev,
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struct v4l2_subdev *sd, struct v4l2_streamparm *a);
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/**
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* v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by
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* calling the s_frame_interval op of the given subdev. It only works
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* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
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* function name.
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*
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* @vdev: the struct video_device pointer. Used to determine the device caps.
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* @sd: the sub-device pointer.
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* @a: the VIDIOC_S_PARM argument.
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*/
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int v4l2_s_parm_cap(struct video_device *vdev,
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struct v4l2_subdev *sd, struct v4l2_streamparm *a);
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/* Compare two v4l2_fract structs */
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#define V4L2_FRACT_COMPARE(a, OP, b) \
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((u64)(a).numerator * (b).denominator OP \
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(u64)(b).numerator * (a).denominator)
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#endif /* V4L2_COMMON_H_ */
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